/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package pl.edu.uj.tcs.mib.colortone;

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import java.io.IOException;
import java.util.List;

/**
 * A simple wrapper around a Camera and a SurfaceView that renders a centered
 * preview of the Camera to the surface. We need to center the SurfaceView
 * because not all devices have cameras that support preview sizes at the same
 * aspect ratio as the device's display.
 */
public class Preview extends ViewGroup implements SurfaceHolder.Callback {

	SurfaceView mSurfaceView;
	SurfaceHolder mHolder;
	Size mPreviewSize;
	List<Size> mSupportedPreviewSizes;
	Camera mCamera;

	private String wbmode = null;

	private void cnstInit(Context context) {
		mSurfaceView = new SurfaceView(context);
		addView(mSurfaceView);

		// Install a SurfaceHolder.Callback so we get notified when the
		// underlying surface is created and destroyed.
		mHolder = mSurfaceView.getHolder();
		mHolder.addCallback(this);
		mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
	}

	public Preview(Context context) {
		super(context);
		cnstInit(context);
	}

	public Preview(Context context, AttributeSet attrs) {
		super(context, attrs);
		cnstInit(context);
	}

	public void zoomIn() {
		Parameters p = mCamera.getParameters();
		if (!p.isZoomSupported())
			return;
		if (p.getZoom() < p.getMaxZoom())
			p.setZoom(p.getZoom() + 1);
		mCamera.setParameters(p);
	}

	public void zoomOut() {
		Parameters p = mCamera.getParameters();
		if (!p.isZoomSupported())
			return;
		if (p.getZoom() > 0)
			p.setZoom(p.getZoom() - 1);
		mCamera.setParameters(p);
	}

	public void setCamera(Camera camera) {
		mCamera = camera;
		setWB(wbmode);
		if (mCamera != null) {
			mSupportedPreviewSizes = mCamera.getParameters()
					.getSupportedPreviewSizes();
			requestLayout();
			if (mPreviewSize != null) {
				mHolder = mSurfaceView.getHolder();
				try {
					mCamera.setPreviewDisplay(mHolder);
				} catch (IOException e) {
					Log.e(CTMain.TAG, Log.getStackTraceString(e));
				}
				mHolder.addCallback(this);
				mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
				surfaceChanged(mHolder, 0, 0, 0);
			}

		}
	}

	public void setWB(String mode) {
		wbmode = mode;
		if (mCamera != null && mode != null) {
			Parameters p = mCamera.getParameters();
			p.setWhiteBalance(mode);
			mCamera.setParameters(p);
		}
	}

	public void switchCamera(Camera camera) {
		setCamera(camera);
		try {
			camera.setPreviewDisplay(mHolder);
		} catch (IOException exception) {
			Log.e(CTMain.TAG, "IOException caused by setPreviewDisplay()",
					exception);
		}
		Camera.Parameters parameters = camera.getParameters();
		parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
		requestLayout();

		camera.setParameters(parameters);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// We purposely disregard child measurements because act as a
		// wrapper to a SurfaceView that centers the camera preview instead
		// of stretching it.
		final int width = resolveSize(getSuggestedMinimumWidth(),
				widthMeasureSpec);
		final int height = resolveSize(getSuggestedMinimumHeight(),
				heightMeasureSpec);
		setMeasuredDimension(width, height);

		if (mSupportedPreviewSizes != null) {
			mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width,
					height);
		}
	}
/*
	public static void setCameraDisplayOrientation(Activity activity,
			int cameraId, android.hardware.Camera camera) {
		android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
		android.hardware.Camera.getCameraInfo(cameraId, info);
		int rotation = activity.getWindowManager().getDefaultDisplay()
				.getRotation();
		int degrees = 0;
		switch (rotation) {
		case Surface.ROTATION_0:
			degrees = 0;
			break;
		case Surface.ROTATION_90:
			degrees = 90;
			break;
		case Surface.ROTATION_180:
			degrees = 180;
			break;
		case Surface.ROTATION_270:
			degrees = 270;
			break;
		}

		int result;
		if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
			result = (info.orientation + degrees) % 360;
			result = (360 - result) % 360; // compensate the mirror
		} else { // back-facing
			result = (info.orientation - degrees + 360) % 360;
		}
		camera.setDisplayOrientation(result);
	}
*/
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		if (changed && getChildCount() > 0) {
			final View child = getChildAt(0);

			final int width = r - l;
			final int height = b - t;

			int previewWidth = width;
			int previewHeight = height;
			if (mPreviewSize != null) {
				previewWidth = mPreviewSize.width;
				previewHeight = mPreviewSize.height;
			}

			// Center the child SurfaceView within the parent.
			if (width * previewHeight > height * previewWidth) {
				//Log.e(CTMain.TAG,"AAAAAAA");
				
				final int scaledChildWidth = previewWidth * height
						/ previewHeight;
				child.layout((width - scaledChildWidth) / 2, 0,
						(width + scaledChildWidth) / 2, height);
			} else {
				
				//Log.e(CTMain.TAG,"BBBBBBB");
				final int scaledChildHeight = previewHeight * width
						/ previewWidth;
				child.layout(0, (height - scaledChildHeight) / 2, width,
						(height + scaledChildHeight) / 2);
			}
		}
	}

	public void surfaceCreated(SurfaceHolder holder) {
		// The Surface has been created, acquire the camera and tell it where
		// to draw.
		try {
			if (mCamera != null) {
				mCamera.setPreviewDisplay(holder);
			}
		} catch (IOException exception) {
			Log.e(CTMain.TAG, "IOException caused by setPreviewDisplay()",
					exception);
		}
	}

	public void surfaceDestroyed(SurfaceHolder holder) {
		// Surface will be destroyed when we return, so stop the preview.
		if (mCamera != null) {
			mCamera.stopPreview();
		}
	}

	private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
		final double ASPECT_TOLERANCE = 0.1;
		double targetRatio = (double) w / h;
		if (sizes == null)
			return null;

		Size optimalSize = null;
		double minDiff = Double.MAX_VALUE;

		int targetHeight = h;

		// Try to find an size match aspect ratio and size
		for (Size size : sizes) {
			double ratio = (double) size.width / size.height;
			if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
				continue;
			if (Math.abs(size.height - targetHeight) < minDiff) {
				optimalSize = size;
				minDiff = Math.abs(size.height - targetHeight);
			}
		}

		// Cannot find the one match the aspect ratio, ignore the requirement
		if (optimalSize == null) {
			//Log.e(CTMain.TAG,"optNULL");
			minDiff = Double.MAX_VALUE;
			for (Size size : sizes) {
				if (Math.abs(size.height - targetHeight) < minDiff) {
					optimalSize = size;
					minDiff = Math.abs(size.height - targetHeight);
				}
			}
		}
		return optimalSize;
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
		// Now that the size is known, set up the camera parameters and begin
		// the preview.
		if (mCamera == null)
			return;

		Camera.Parameters parameters = mCamera.getParameters();
		parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
		// parameters.setPreviewFormat(ImageFormat.);
		requestLayout();

		mCamera.setParameters(parameters);
		mCamera.startPreview();
	}

}
